WATERLOO — A man was stabbed in the back and three men were struck by a car during a wild altercation on a Waterloo street early Saturday morning.

It happened just after 3 a.m. on Lester Street, between Seagram Drive and University Avenue West. Waterloo Regional Police allege a driver drove his car at three men, striking them.

The victims were treated at hospital and later released. The driver, an 18-year-old male from Brampton, is charged with three counts of criminal negligence causing bodily harm, and also dangerous operation of a motor vehicle.

A 20-year-old man was stabbed in the back during the melee, police say. Injuries were minor.